US11876475B2 - Apparatus for controlling motor and method for controlling motor - Google Patents
Apparatus for controlling motor and method for controlling motor Download PDFInfo
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- US11876475B2 US11876475B2 US17/671,785 US202217671785A US11876475B2 US 11876475 B2 US11876475 B2 US 11876475B2 US 202217671785 A US202217671785 A US 202217671785A US 11876475 B2 US11876475 B2 US 11876475B2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
- H02P5/50—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another by comparing electrical values representing the speeds
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/08—Control circuits or arrangements thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/30—Driving arrangements
- D06F37/304—Arrangements or adaptations of electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/10—Power supply arrangements, e.g. stand-by circuits
Definitions
- the present disclosure relates to a motor control apparatus and a motor control method, and one particular implementation relates to a motor control apparatus and a method for controlling driving of a plurality of motors using one inverter.
- a clothes treating apparatus may include a circulation pump and a drain pump as a washing apparatus for removing contamination of cloth (laundry) such as clothes, bedding, and the like, and may further include a drying fan as a drying apparatus for drying laundry.
- the clothes treating apparatus may separately include motors (for example, a motor corresponding to the circulation pump, a motor corresponding to the drain pump, a motor corresponding to the drying fan) for implementing respective functions of the circulation pump, the drain pump, and the drying fan.
- the electronic apparatus may need to include a number of inverters for controlling driving of the motors as many as corresponding to the number of the motors so that each of the motors is separately operated according to a specified driving condition.
- expensive circuit components such as a power switching device, a capacitor, and a sensing circuit
- manufacturing costs of the electronic apparatus increases in proportion to an increase in the number of the inverters.
- FIG. 1 is a diagram illustrating a clothes treating apparatus according to an example embodiment of the present disclosure
- FIG. 2 is a schematic configuration block diagram of an electronic apparatus including a motor control apparatus according to an example embodiment of the present disclosure
- FIG. 3 is a schematic circuit diagram for describing connection scheme switching (or connection switching) by a motor control apparatus according to an example embodiment of the present disclosure
- FIG. 4 is a schematic circuit diagram for describing connection scheme switching (or connection switching) by a motor control apparatus according to an example embodiment of the present disclosure
- FIGS. 5 ( a ) and ( b ) are schematic graphs for describing a method for checking an abnormal connection by the motor control apparatus according to an example embodiment of the present disclosure
- FIG. 6 is a schematic graph for describing the method for checking the abnormal connection by the motor control apparatus according to an example embodiment of the present disclosure
- FIG. 7 is a diagram for describing an input signal of a motor control apparatus according to an example embodiment
- FIG. 8 is a diagram for describing the input signal of the motor control apparatus according to an example embodiment
- FIG. 9 is a flowchart of a motor control method according to an example embodiment of the present disclosure.
- FIG. 10 is a flowchart of a motor control method according to an example embodiment of the present disclosure.
- FIG. 1 is a diagram illustrating a clothes treating apparatus according to an example embodiment of the present disclosure.
- a clothes treating apparatus 100 may include a drum type clothes treating apparatus in which cloth is inserted into a washing tub (for example, a drum 122 ) open in the front thereof.
- the clothes treating apparatus 100 described in the present disclosure is not limited to the above-described drum type structure, and the clothes treating apparatus 100 according to various example embodiments may include a full-automatic clothes treating apparatus using a method of inserting cloth into a washing tub open in an upper surface direction.
- the clothes treating apparatus 100 may correspond to an apparatus that performs at least one of washing, rinsing, dewatering, and drying on the cloth inserted into the washing tub.
- the clothes treating apparatus 100 may include at least one of a cabinet 110 forming an exterior thereof, a tub 120 disposed inside the cabinet 110 and supported by the cabinet 110 , a drum 122 , which is disposed inside the tub 120 and in which cloth is inserted and washed, a motor 130 configured to drive the drum 122 , a circulation pump disposed outside a cabinet body 111 and configured to supply washing water to the inside of the cabinet 110 , and a drain pump configured to discharge the washing water to the outside.
- the clothes treating apparatus 100 may further include a drying fan that dries the washed cloth.
- the drum 122 may include a plurality of through-holes 122 A through which washing water passes, and may further include a lifter 124 disposed on an inner side surface of the drum 122 such that laundry is lifted to a certain height when the drum 122 rotates and then is dropped due to gravity.
- the cabinet 110 may include at least one of the cabinet body 111 , a cabinet cover 112 that is disposed on the front of the cabinet body 111 and combined with the cabinet body 111 , a control panel 115 that is disposed on an upper side of the cabinet cover 112 and combined with the cabinet body 111 , and a top plate 116 that is disposed on an upper side of the control panel 115 and combined with the cabinet body 111 .
- the cabinet cover 112 may include a cloth entrance hole 114 through which cloth enters or exits, and a door 113 disposed to be rotatable to the left and right such that the cloth entrance hole 114 may be open and closed.
- the control panel 115 may include operation keys 117 for operating operation states of the clothes treating apparatus 100 , and a display 118 disposed on one side of the operation keys 117 and configured to display the operation states of the clothes treating apparatus.
- the operation keys 117 and/or the display 118 of the control panel 115 may be electrically connected to a controller (for example, a controller 210 of FIG. 2 ), and each of components of the clothes treating apparatus 100 may be electrically controlled by the controller.
- a controller for example, a controller 210 of FIG. 2
- the clothes treating apparatus 100 may further include various sensors and other devices.
- the clothes treating apparatus may further include a vibration sensor for measuring the amount of vibration of the drum 122 , or may further include a device for detecting and reducing vibration generated according to the amount of eccentricity of cloth accommodated in the drum 122 .
- FIG. 2 is a schematic configuration block diagram of an electronic apparatus including a motor control apparatus according to an example embodiment of the present disclosure.
- An electronic apparatus (for example, the clothes treating apparatus 100 of FIG. 1 ) according to various example embodiments may include at least one of a motor 230 , a motor control apparatus 200 configured to control the motor 230 , an input module (for example, an operation key 260 ), and an output module (for example, a display 250 ).
- the motor 230 may include a plurality of motors.
- the motor 230 may include a first motor corresponding to a circulation pump and a second motor corresponding to a drying fan.
- the motor 230 may include a first motor corresponding to a circulation pump, a second motor corresponding to a drying fan, and a third motor corresponding to a drain pump.
- the plurality of motors may be provided with a circuit configuration so that a driving operation may be controlled by a specific single inverter (included as an inverter part 220 of the motor control apparatus 200 ).
- each of the above-described plurality of motors may include a stator and a rotor, and may include a three-phase motor in which the rotor rotates as alternating current (AC) power of a predetermined frequency is applied to a coil of the stator.
- the plurality of motors may include a surface-mounted permanent magnet synchronous motor (SMPMSM), an interior permanent magnet synchronous motor (IPMSM), and a synchronous reluctance motor (Synrm).
- the motor control apparatus 200 may include the inverter part 220 , a switch 240 , and a controller 210 .
- the motor control apparatus 200 may correspond to an apparatus for overall controlling driving operation of the motor 230 .
- the switch 240 may be considered as part of the motor control apparatus 200 .
- the inverter part 220 may be an inverter configured to receive direct current (DC) power from the outside, convert the DC power into AC power, and provide the converted AC power to the motor 230 , or may correspond to a configuration including the inverter.
- the inverter part 220 may include a plurality of inverter switching elements, and convert smoothed DC power into three-phase AC power having a predetermined frequency according to an on/off operation of the switching element, and output the three-phase AC power to the motor 230 .
- the switching elements of the inverter part 220 may be controlled to be an on/off state based on an inverter control signal generated from the controller 210 (or provided from the controller 210 ), and the AC power corresponding to the predetermined frequency may be output to the motor 230 through an output terminal of the inverter part 220 .
- the inverter control signal may be a switching control signal for a pulse width modulation (PWM) method, and the inverter control signal may be provided based on an output current detected by an output current detector, which may be described below, and an output voltage detected by an output voltage detector.
- PWM pulse width modulation
- the switch 240 may switch connection schemes (or different connections) between the inverter and the motors so that the motor control apparatus 200 may selectively drive two or more motors (for example, the motor 230 ) through a single inverter (for example, the inverter part 220 ).
- the switch 240 may switch connections such that the inverter part 220 is connected to any one of the plurality of motors (of the motor 230 ) according to the control signal of the controller 210 .
- the switch 240 may include a plurality of three-contact relays.
- a connection-switching operation of the switch 240 may be based on the control signal that enables each of the plurality of three-contact relays to be open and closed.
- each of the three-contact relays may include a common terminal, a normally open terminal, and a normally closed terminal.
- the normally open terminal and the normally closed terminal of the three-contact relay may be respectively connected to different motors (for example, to an input terminal of each of the motors).
- the common terminal may be connected to the inverter part 220
- the normally open terminal may be connected to one of the plurality of motors (for example, a first motor)
- the normally closed terminal may be connected to another one of the motors (for example, a second motor).
- the switch 240 may include a total number of relays (for example, three-contact relays) which corresponds to the number of the motors driven by one inverter.
- the switch 240 may include a first relay and a second relay for connecting the inverter to the first motor and the second motor, respectively.
- the switch 240 may include a first relay, a second relay, and a third relay.
- each of the motors may include three input terminals.
- the switch 240 includes first to third relays
- the three input terminals provided in one of the plurality of motors may be respectively connected to a particular terminal (for example, a normally open terminal) of the first relay, a particular terminal (for example, a normally closed terminal) of the second relay, and a particular terminal (for example, a normally closed terminal) of the third relay.
- the three input terminals provided in another one motor may be respectively connected to a particular terminal (for example, a normally closed terminal) of the first relay, a particular terminal (for example, a normally open terminal) of the second relay, and a particular terminal (for example, a normally closed terminal) of the third relay
- the three input terminals provided in the other one motor for example, a third motor
- the three input terminals provided in the other one motor may be respectively connected to a particular terminal (for example, the normally closed terminal) of the first relay, a particular terminal (for example, the normally closed terminal) of the second relay, and a particular terminal (for example, the normally open terminal) of the third relay.
- the switch 240 when the motor 230 includes two motors, the switch 240 includes first and second relays, three input terminals provided in each of the motors (for example, a first motor and a second motor) may be respectively connected to a particular terminal (for example, a normally open terminal) of the first relay, a particular terminal (for example, a normally closed terminal) of the second relay, and a particular output terminal of the inverter part 220 .
- the controller 210 may control the driving operation of the motor 230 using at least one of the inverter part 220 and the switch 240 .
- the controller 210 may provide (or generate) a control signal for switching connection schemes so that the inverter part 220 is connected to one of the plurality of motors (included in the motor 230 ) and provide the control signal to the switch 240 , and when it is confirmed that a connection is normal through a predetermined connection abnormality check procedure, the controller 210 may provide (or generate) a control signal for driving the specific motor connected to the inverter part 220 and provide the control signal to the inverter part 220 .
- the controller 210 may control the inverter part 220 to output an input signal of a specific pattern for checking whether there is an abnormality in the connections in response to switching connection schemes (i.e., changing connections) of the motor 230 by the switch 240 .
- the controller 210 may identify whether there is an abnormality in the connections of the circuit based on f a response signal detected in response to the input signal, and may provide (or generate) a predetermined control signal for controlling at least one of the inverter part 220 or the switch 240 based on a result of the identification.
- the controller 210 may check whether the connection according to the switching is abnormal. For example, the controller 210 may control the inverter part 220 to apply an input signal of a specific pattern in response to the switching of the connection schemes, and check a response signal corresponding to the applied input signal to check whether there is an abnormality in the connections.
- the input signal of the specific pattern applied to the motor 230 from the inverter part 220 may correspond to any one of a DC pattern signal (for example, a DC signal) or an AC pattern signal (for example, an AC signal).
- a DC pattern signal for example, a DC signal
- an AC pattern signal for example, an AC signal
- the controller 210 may control the inverter part 220 to sequentially apply, as the input signal to check whether there is an abnormality in the connections, DC sub-pattern signals having different magnitudes (for example, a DC sub-pattern signal of a first magnitude and a DC sub-pattern signal of a second magnitude).
- the controller 210 may control the inverter part 220 to sequentially apply, as the input signal to check whether the connection is abnormal, AC sub-pattern signals having different amplitudes (for example, an AC sub-pattern signal of a first amplitude and an AC sub-pattern signal of a second amplitude).
- the controller 210 may control the switching operation of the inverter part 220 through a sensorless method. For example, the controller 210 may acquire a value of an output current detected by the output current detector, a value of an output voltage detected by the output voltage detector, and check characteristics of the response signal for checking whether there is an abnormality in the connections by using the output current detector and the output voltage detector.
- the output current detector may detect an output current flowing between the inverter part 220 and the motor 230 . That is, current flowing to the motor 230 may be detected.
- the output current detector may detect all of output currents (for example, ia, ib, and ic) of each phase, or detect output currents of two phases using a three-phase balance and estimate an output current of the remaining phase.
- the output current detector may be positioned between the inverter part 220 and the motor 230 , and a current transformer (CT), a shunt resistor, and/or the like may be used to detect current.
- CT current transformer
- a shunt resistor when used, it may be configured such that three shunt resistors are positioned between the inverter part 220 and the motor 230 , or may be connected respectively, at one terminal thereof, to three lower arm switching elements of the inverter part 220 .
- two shunt resistors may be used, and as still another example, it may be configured such that one shunt resistor is used and the shunt resistor is positioned between the specific capacitor and the inverter part 220 .
- the detected output current may include a pulse-type discrete signal, and a predetermined control signal may be provided (or generated) by the controller 210 based on the detected output current.
- the output voltage detector is positioned between the inverter part 220 and the motor 230 , and may detect an output voltage that is applied to the motor 230 from the inverter part 220 .
- the output voltage may be PWM-based pulse type voltage.
- the output voltage detector may include a resistance element electrically connected between the inverter part 220 and the motor 230 , and a comparator connected to one end of the resistance element.
- the detected output voltage may include a pulse-type discrete signal, and a predetermined control signal may be provided (or generated) by the controller 210 on the basis of the detected output voltage.
- the controller 210 may calculate (or determine) a parameter value corresponding to the specific motor connected to the inverter part 220 on the basis of a response signal corresponding to the input signal. On the basis of the parameter value calculated on the basis of the response signal, the controller 210 may identify the type of the specific motor currently connected to the inverter part 220 according to the switching of the connection schemes of the circuit.
- the controller 210 may check (or determine) a motor driving command such as a driving start command of the motor 230 or a driving stop command of the motor 230 on the basis of a user input related to a washing operation such as washing, rinsing, dehydration, or drying received using a predetermined input module such as the operation key 260 , and may perform a driving control operation of the motor 230 on the basis of the motor driving command.
- the controller 210 may apply an input signal of a predetermined pattern before starting the motor 230 , identify the type of the motor connected to the inverter part 220 on the basis of a response signal corresponding to the input signal, and check whether the identified motor corresponds to the washing operation to be currently carried out.
- the controller 210 may use a predetermined output module such as the display 250 and control the display 250 to display status information related to washing operations including at least some of a washing course, a washing time, a dehydration time, and a rinsing time.
- a predetermined output module such as the display 250 and control the display 250 to display status information related to washing operations including at least some of a washing course, a washing time, a dehydration time, and a rinsing time.
- the motor control apparatus 200 may further include a memory for storing instructions related to the control command (for example, a control algorithm) of the controller 210 or data related to setting for driving the motor.
- the motor control apparatus 200 may store threshold data used to identify whether there is an abnormality in the connections, parameter value-related data corresponding to the plurality of motors included in the motor 230 , and the like in the memory, and may check whether there is an abnormality in the connections, for example, the motor connected to the inverter corresponds to a specified washing operation by using the corresponding data.
- the motor control apparatus 200 may further include a communication module configured to transmit and receive commands or pieces of data stored in the memory to and from an external device.
- FIG. 3 is a schematic circuit diagram for describing connection scheme switching (or connection switching) by a motor control apparatus according to an example embodiment of the present disclosure.
- a motor control apparatus (for example, the motor control apparatus 200 of FIG. 2 ) according to an example embodiment may include a controller 310 , an inverter 320 configured to control driving of a plurality of motors 330 according to a predetermined control signal generated by (or provided by) the controller 310 , and a switch 340 configured to switch connection structures between the inverter 320 and the motors 330 according to a control signal generated by the controller 310 .
- the inverter 320 may convert a predetermined DC power into AC power and provide the AC power to an output terminal.
- the output terminal of the inverter 320 may be connected to the switch 340 , and may be connected to any one of the plurality of motors 330 by the switch 340 in order to supply the AC power to the specific motor (for example, input terminals of the motor).
- the output terminal of the inverter 320 may include three output terminals respectively corresponding to three phases.
- the switch 340 may include a plurality of relays in which a total number of the relays corresponds to the total number of the plurality of motors 330 .
- the motors 330 whose driving is controlled by the inverter 320 , may include a first motor M 1 , a second motor M 2 , and a third motor M 3
- the relays of the switch 340 may include a first relay A, a second relay B, and a third relay C.
- each of the plurality of relays included in the switch 340 may include a three-contact relay, which each includes a common terminal, a normally open terminal, and a normally closed terminal.
- the common terminals of the plurality of relays may be connected to the three output terminals of the inverter 320 , respectively.
- the normally open terminals and the normally closed terminals of the plurality of relays may be connected to input terminals of the different motors, respectively.
- Each of the relays constituting the switch 340 may change a state (for example, an ON state and an OFF state) thereof on the basis of a control signal generated by the controller 310 .
- the first relay A may connect the inverter 320 to the first motor M 1 in an ON state and may connect the inverter 320 to the second motor M 2 and the third motor M 3 in an OFF state.
- the second relay B may connect the inverter 320 to the second motor M 2 in an ON state, and connect the inverter 320 to the first motor M 1 and the third motor M 3 in an OFF state.
- the third relay C may connect the inverter 320 to the third motor M 3 in an ON state, and connect the inverter 320 to the first motor M 1 and the second motor M 2 in an OFF state.
- the controller 310 may provide (or generate) a control signal to turn on the first relay A, to turn off the second relay B, and to turn off the third relay C.
- the first relay A may be switched to the ON state
- the second relay B and the third relay C may be switched to the OFF state
- the three-phase output terminals of the inverter 320 may be connected to the three-phase input terminals of the first motor M 1 , respectively.
- the controller 310 may provide (or generate) a control signal to turn off the first relay A, to turn on the second relay B, and to turn off the third relay C.
- the controller 310 may provide (or generate) a control signal to turn off the first relay A, to turn on the second relay B, and to turn off the third relay C.
- the controller 310 may provide (or generate) a control signal to turn off the first relay A, to turn on the second relay B, and to turn off the third relay C.
- the controller 310 may provide (or generate) a control signal to turn off the first relay A, to turn on the second relay B, and to turn off the third relay C.
- the controller 310 may provide (or generate) a control signal to turn off the first relay A and the second relay B, and to turn on the third relay C. Accordingly, the first relay A and the second relay B are switched to the OFF state, and the third relay C is switched to the ON state, and the three-phase output terminals of the inverter 320 may be connected to the three-phase input terminals of the third motor M 3 , respectively.
- each of the first motor M 1 , the second motor M 2 , and the third motor M 3 of FIG. 3 may correspond to any one of a motor mounted on a circulation pump provided in a clothes treating apparatus (for example, the clothes treating apparatus 100 of FIG. 1 ), a motor mounted on a drain pump, and a motor mounted on a drying fan.
- the controller 310 of the motor control apparatus may control the switch 340 to connect the motor corresponding to the washing operation to be carried out to the inverter 320 , and control the inverter 320 to drive the motor only when the connection switching is successfully completed.
- FIG. 4 is a schematic circuit diagram for describing connection scheme switching (or connection switching) by a motor control apparatus according to an example embodiment of the present disclosure.
- a motor control apparatus (for example, the motor control apparatus 200 of FIG. 2 ) according to an example embodiment may include a controller 410 , an inverter part 420 (or inverter) configured to control driving of motors 430 based on a predetermined control signal generated by the controller 410 , and a switch 440 configured to switch connection schemes (or connection switching) between the motors 430 and the inverter part 420 based on a control signal from the controller 410 .
- the motors 430 may include a first motor M 1 , a second motor M 2 , and a third motor M 3 .
- driving operation of the first motor M 1 and the second motor M 2 may be controlled by a first inverter 421
- driving operation of the third motor M 3 may be controlled by a second inverter 422 .
- the first motor M 1 and the second motor M 2 may each be a motor mounted on a circulation pump of a clothes treating apparatus (for example, the clothes treating apparatus 100 of FIG. 1 ) or a motor mounted on a drying fan
- the third motor M 3 may be a motor mounted on a drain pump of the clothes treating apparatus.
- the driving of the third motor M 3 may be controlled by a separate inverter (for example, the second inverter 422 ) regardless of the driving of the first motor M 1 and the second motor M 2 , and the third motor M 3 may be independently driven together with either the first motor M 1 or the second motor M 2 at the same time.
- the switch 440 may include a plurality of relays.
- the switch 440 may include a plurality of relays in which a total number of the relays corresponds to a total number of the motors (for example, the first motor M 1 and the second motor M 2 ) controlled by one inverter (for example, the first inverter 421 ).
- the switch 440 may include a first relay A and a second relay B each connected to one of three output terminals of the first inverter 421 .
- Each of the plurality of relays is a three-contact relay, and may include a common terminal, a normally open terminal, and a normally closed terminal.
- the common terminal of each of the relays may be connected to any one of the output terminals of the first inverter 421 , and the normally open terminal and the normally closed terminal of each of the relays may be connected to input terminals of the different motors, respectively.
- Each of the motors 430 may include three input terminals, one of the input terminals of the motor (for example, the first motor M 1 or the second motor M 2 ) whose driving is controlled by the first inverter 421 may be connected to the first relay A, and another one of the input terminals may be connected to the second relay B. The remaining one of the input terminals may be directly connected to the specific output terminal of the first inverter 421 without passing through the specific relay.
- the first relay A may be connected to the first motor M 1 in an ON state and may be connected to the second motor M 2 in an OFF state
- the second relay B may be connected to the second motor M 2 in an ON state and may be connected to the first motor M 1 in an OFF state.
- the controller 410 may generate (or provide) a control signal to turn on the first relay A and to turn off the second relay B.
- the first relay A may be in an ON state and the second relay B may be in an OFF state, and the three-phase output terminals of the first inverter 421 may be connected to the three-phase input terminals of the first motor M 1 , respectively.
- the controller 410 may generate (or provide) a control signal to turn off the first relay A and to turn on the second relay B.
- the first relay A may be in an OFF state and the second relay B may be in an ON state, and thus, the three-phase output terminals of the first inverter 421 may be connected to the three-phase input terminals of the second motor M 2 , respectively.
- each of three-phase input terminals of the third motor M 3 may be always connected to any one of the three-phase output terminals of the second inverter 422 .
- the controller 410 may control the driving of the third motor M 3 using the second inverter 422 .
- FIGS. 5 and 6 are schematic graphs for describing a method for checking an abnormal connection by the motor control apparatus according to an example embodiment of the present disclosure.
- the inverter may convert DC voltage into AC voltage of three phases (for example, a U-phase, a V-phase, and a W-phase) and provide the AC voltage to the motor side.
- the controller may control the inverter through PWM.
- the controller may control an operation of the switch to switch circuit connection schemes between the inverter and the plurality of motors, and may control the inverter to output an input signal of a predetermined pattern from the inverter in response to the operation of the switch of switching the circuit connection schemes.
- the controller may detect a response signal corresponding to the input signal through the output current detector or the output voltage detector.
- an input signal of a predetermined pattern which is output to detect whether there is an abnormality in the circuit connections, may correspond to any one of a DC signal, a DC voltage signal, an AC signal, or an AC voltage signal.
- the controller may output an input signal through one of output terminals of three phases (a U-phase, a V-phase, and a W-phase) of the inverter, and detect a response signal flowing through another terminal.
- three phases a U-phase, a V-phase, and a W-phase
- the controller may check whether there is an abnormality in the connections on the basis of the detected response signal.
- the controller may output a U-phase current as the input signal and detect a W-phase current (or a V-phase current) as the response signal.
- the controller may determine that the circuit connection of the motor is normal. In this case, the controller may generate a control command for controlling the inverter to start the driving of the motor.
- the controller may determine that the circuit connection of the motor is abnormal. In this case, the controller may provide a notification related to the abnormal connection through the output module, or generate (or provide) a control command for controlling the switch to again change the connection state of the circuit.
- a response signal having a magnitude less than a magnitude of the input signal when a response signal having a magnitude less than a magnitude of the input signal is detected, it may be determined that the circuit is normally connected, and when a response signal having a magnitude substantially equal to the magnitude of the input signal is detected or a response signal of a magnitude of 0 is detected, the controller may determine that abnormality has occurred in the circuit connection.
- the controller may determine that the circuit is normally connected when the magnitude of the response signal is within a specified first range, and may determine that the circuit is abnormally connected when the magnitude of the response signal is within a specified second range.
- the controller may control to perform the operation of checking whether there is an abnormality in the connections again.
- the controller may apply an input signal different from the previously applied input signal, and detect a response signal corresponding to the input signal to check again whether there is an abnormality in the connections.
- the controller may apply an AC signal other than the DC signal as the input signal, or apply an input signal of a V-phase or a W-phase and detect a response signal according thereto.
- FIGS. 7 and 8 are diagrams for describing an input signal of a motor control apparatus according to an example embodiment.
- the motor control apparatus may apply an input signal of a predetermined pattern through the inverter, and check a parameter value corresponding to the motor connected to the inverter on the basis of a response signal corresponding to the input signal.
- the motor control apparatus may check at least one of a phase resistance value or an inductance value corresponding to the motor connected to the inverter on the basis of the response signal.
- the motor control apparatus may identify whether there is an abnormality in the connections of the circuit on the basis of the parameter value.
- the input signal applied by the motor control apparatus may include DC sub-pattern signals having different magnitudes, for example, a DC sub-pattern signal of a first magnitude and a DC sub-pattern signal of a second magnitude.
- the DC sub-pattern signal of the first magnitude and the DC sub-pattern signal of the second magnitude may be sequentially output through the inverter.
- the input signal may be a current signal or a voltage signal. For example, as shown in FIG. 7 , a sub-pattern current signal of a first magnitude i 1 may be applied from T 1 to T 2 , and a sub-pattern current signal of a second magnitude i 2 may be applied from T 3 to T 4 .
- the controller of the motor control apparatus may check a current magnitude I ds1 and a voltage magnitude V ds1 in a section between T 1 and T 2 , and check a current magnitude I ds2 and the voltage magnitude V ds2 in a section between T 3 and T 4 , and estimate a resistance value R s corresponding to the motor connected to the inverter using Equation 1 below.
- the input signal may include AC sub-pattern signals having different amplitudes, for example, an AC sub-pattern signal of a first amplitude and an AC sub-pattern signals of a second amplitude.
- the AC sub-pattern signal of the first amplitude and the AC sub-pattern signal of the second amplitude may be sequentially output through the inverter and may be AC signals or AC voltage signals.
- a sinusoidal sub-pattern current signal of a first amplitude i 3 may be applied in a section between T 5 and T 6 as the input signal
- a sinusoidal sub-pattern current signal of a second amplitude i 4 may be applied in a section between T 6 and T 7 .
- the motor control apparatus may apply a sinusoidal signal of a specific frequency (for example, 60 Hz) of an arbitrary control angle (or phase) as the input signal regardless of a position of the rotor of the motor.
- the controller may check values of i dh , i qh , and V qh in each of the section between T 6 and T 6 and the section between T 6 and T 7 .
- the controller may estimate an inductance value L s corresponding to the motor connected to the inverter using Equation 2 below.
- the motor control apparatus may estimate a parameter value (for example, a phase current value or an inductance value) of the motor on the basis of a current value and/or a resistance value of a response signal corresponding to an input signal of a predetermined pattern, and may identify the type of the motor connected to the inverter on the basis of the estimated parameter value of the motor.
- the controller may check whether the motor to be currently started in the electronic apparatus (for example, the clothes treating apparatus) corresponds to the motor connected to the inverter, and when the motor corresponding to the specific driving command is not connected to the inverter, the controller may generate a control command for switching the connection schemes of the circuit again and provide the control command to the switch.
- the motor control apparatus may not drive the motor even when the inverter is normally connected to the specific motor, and may control to change the connection state between the motor and the inverter in order to prevent malfunctions.
- FIG. 9 is a flowchart of a motor control method according to an example embodiment of the present disclosure.
- the motor control apparatus (for example, the motor control apparatus 200 of FIG. 2 ) may switch connection schemes between the inverter and the plurality of motors in operation 910 .
- the controller of the motor control apparatus may control the switch by generating a control signal for switching the connection schemes between the plurality of motors connected to one inverter.
- the switch may perform a switching operation of predetermined relays so that the inverter is connected to the specific motor according to the control signal related to the connection scheme switching.
- the motor control apparatus may provide a control signal to the inverter in response to the completion of the switching operation so that an input signal of a specific pattern is applied through the inverter.
- the motor control apparatus may detect a response signal corresponding to the input signal applied from the inverter, and may identify whether there is an abnormality in the connections on the basis of characteristics of the response signal.
- the motor control apparatus may generate a control signal for driving the motor and provide the control signal to the inverter. Meanwhile, when it is determined that the inverter and the specific motor are abnormally connected, the motor control apparatus may generate a control signal for switching the connection states of the circuit again instead of driving the motor, and provide the control signal to the switch, and when it is determined that the circuit is normally connected, the motor control apparatus may provide a control signal for starting the motor.
- FIG. 10 is a flowchart of a motor control method according to an example embodiment of the present disclosure.
- the motor control apparatus may control the inverter to be connected to any one of the plurality of motors by switching connection schemes between the inverter and the motors in operation 1010 , may control the inverter to apply an input signal of a specific pattern in response to the switching of the connection schemes in operation 1020 , and may check a response signal corresponding to the applied input signal in operation 1030 .
- the motor control apparatus may check whether the connection is normal on the basis of whether a magnitude of the response signal is within a specified range.
- a motor control apparatus may estimate a parameter value of a motor connected to an inverter on the basis of a response signal, and check the type of the motor connected to the inverter on the basis of the estimated parameter value.
- the motor control apparatus may determine that the connections are abnormal, and may generate a control signal for switching the connection schemes in operation 1060 and provide the control signal to the switch.
- the motor control apparatus determines the currently connected status as a normal connection and may generate a control signal for driving the motor currently connected to the inverter in operation 1050 and provide the control signal to the inverter unit in operation 1050 .
- the above-described example embodiments of the motor control apparatus and the motor control method according to the present disclosure may be applied to and implemented on a motor control apparatus provided in a motor, for example, an inverter apparatus for controlling the motor, a motor including the same, a control method for the motor, or the like.
- the example embodiments may be effectively applied to and implemented on a control apparatus, a control system, and a control method for controlling an initial operation of a motor, a control apparatus a control system, and a control method for aligning a position of a motor, a control apparatus, a control system, a control method for detecting a position of a motor, or the like.
- example embodiments may also be effectively applied to and implemented on a compressor control apparatus provided in a compressor including a motor, for example, an inverter apparatus for controlling a motor of a compressor, a compressor including the same, a control method for the compressor, or the like.
- a compressor control apparatus provided in a compressor including a motor
- an inverter apparatus for controlling a motor of a compressor, a compressor including the same, a control method for the compressor, or the like.
- techniques disclosed herein are not limited thereto, and may also be applied to and implemented on all motor control apparatuses, motor control systems and motor control methods, home appliances including the motor, control apparatuses for home appliances including the motor, and control systems and control methods for home appliances including the motor to which the technical concept of the present disclosure is applicable.
- the terms “ ⁇ er (or) etc.” may be a hardware component, such as a processor or circuit, and/or a software component executed by the hardware configuration, such as a processor.
- An aspect provides an electronic apparatus in which the number of inverters is minimized in such a manner that driving of a plurality of motors that do not need to be simultaneously driven among motors included in the electronic apparatus are controlled using one inverter.
- An aspect also proposes an electronic apparatus capable of preventing malfunction of the electronic apparatus or damage to parts when the electronic apparatus is implemented to control driving of a plurality of motors with one inverter by checking whether the inverter and the motor are properly connected according to a driving situation of each of the motors, and controlling the driving of the motor on the basis of whether there is an abnormality in the connections.
- a motor control apparatus including an inverter configured to convert direct current (DC) power into alternating current (AC) power and provide the AC power to one of a plurality of motors, a switch configured to switch connection schemes between the inverter and the plurality of motors, and a controller, and the controller may control the inverter to output an input signal of a predetermined pattern in response to the switching of the connection schemes by the switch, and generate a control signal for controlling the inverter or the switch on the basis of a response signal corresponding to the input signal.
- DC direct current
- AC alternating current
- a motor control method including switching, by using a switch, connection schemes so that an inverter is connected to one of a plurality of motors, controlling the inverter to output an input signal to one motor connected to the inverter in response to the switching of the connection schemes, checking a response signal corresponding to the input signal, and generating a control signal for controlling one of the switch or the inverter on the basis of the response signal.
- an electronic apparatus for example, a clothes treating apparatus
- implement a more compact circuit design by using a motor control apparatus and method for controlling driving of two or more motors using one inverter.
- a response signal according to an input signal can be checked without providing a separate sensor, so that it is possible to identify whether switching of connection schemes is performed without a problem, and even when an abnormal connection occurs due to fusion of a relay or burnout of a switch, it is possible to prevent problems such as noise and equipment damage that may occur because a motor is driven without recognizing the occurrence of the abnormal connection.
- a situation in which another motor other than a motor corresponding to a driving command is driven while being connected to an inverter can be prevented from occurring in advance by checking whether the specific motor, which is connected to the inverter according to switching of connection schemes, is the same as the motor to be actually driven.
- first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
- spatially relative terms such as “lower”, “upper” and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “lower” relative to other elements or features would then be oriented “upper” relative to the other elements or features. Thus, the exemplary term “lower” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
- Embodiments are described herein with reference to cross-section illustrations that are schematic illustrations of idealized embodiments (and intermediate structures). As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing.
- any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc. means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment.
- the appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment.
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US8245523B2 (en) * | 2006-11-29 | 2012-08-21 | Lg Electronics Inc. | Multi-air conditioner |
EP2072919A1 (en) * | 2007-12-21 | 2009-06-24 | LG Electronics, Inc. | Air conditioner |
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US20220263436A1 (en) | 2022-08-18 |
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